Bubbing machine



April 17, 192s. 1,666,256

G. H. EKSTROM Y RUBBING MACHINE Filed [rune 11, 192s Patented Apr. 17,1928.

GUSTAF H- EKSTROM. 66C. aaa-16m.

Application filed .Tune 11, 1923.

The invention relates to improvements in rubbing and polishing machineshaving reciprocatory rubbing elements, and particularly to theattachment and construction of the pad holders for such machines.

lMachines of the above type are commonly constructed with elongatedrubbing pads arranged to reciprocate sided by side, or with padsarranged to reciprocate toward and from each other. In both instanceseach pad holder is usually rigidly connected to a downwardly displacedattaching portion of a bearing slide or other reciprocating member andis therefore poorly adapted for work on curved surfaces. This isparticularly true of pad holders which are arranged to reciprocatetoward and from each other.

The primary object of the invention is to provide a rubbin machinehaving pivotal pad holders which is well adapted for work on curvedsurfaces.

A further object is to provide a rubbing machine having pad holdersarranged to reciprocate toward and from each other, which is adapted forwork on curved surfaces.

Another object is to provide a rubbing machine in which a plurality ofpad holders are pivotally mounted to each bearing slide at opposite endsof the machine.

Further objects and advantages will become apparent as the descriptionproceeds.

In the drawings, wherein I have illustrated the preferred embodiment ofmy invention, Figure 1 is a side elevation of the rubbing machine. tion.Fig. 3 is a perspective view on a large scale of a bearing slide formingpart of the machine.

Referring to the drawings, 10 indicates the body of a rubbing machine ofwell known construction which houses the bearing slides 11 adapted to bereciprocated therein.

Each bearing slide 11 is formed with a downwardly displaced attachingportion 12 at one end. Downwardly extending projections 13 havinglongitudinal bores 14 therethrough are formedat opposite sides of theportions 12. Pad holders 15 supporting rubbing pads 16 and havingupstanding lugs 17 overlapping with the projections 13 are pivotallysecured to the latter by pins 18. The lower ends of the projections 13are rounded, and the pad holders which are Fig. 2 is an end eleva-Serial No. 644,565.

arranged sidel by side are sufliciently spaced from each other to allowa free pivotal movement about the pins 18.

By providing pivotal pad holders, a rubbing machine is obtained which isparticularly adapted for work on curved surfaces. By attaching padholders to the rounded projections 13 at opposite sides of the bearingplates which are arranged to reciprocate toward and from each other, amachine adapted for work on curved surfaces is obtained which is alsofree from an objectionable amount of vibration and side wobble.

It is to be noted lespecially that there are a plurality of pad holderssecured to the reciprocatory means on two spaced fixed axes constrainedto extend at all times in the direction of reciprocation. The padholders are in the present instance adapted to form a trough. By thisconstruction pad holders on the separate axes can be made toassume anangular relation to each other, which adapts them for reciprocationalong the elements of a curved surface, such as a cylinder, for example.It is further to be noted that the angularity produced by the pivotalrelations described is important only as between the pad holders and notpart-icularly so as between each pad holder and the reciprocating means.In the present instance, two pads on one side are arranged to lie in thesame plane and the other two pad holders, laterally offset relative tothe first, are pivoted on alined axes so that both end sets togetherform alined troughs.

While I have herein disclosed the preferred embodiment of my inventionwith considerable particularity for purposes of illustration, variouschanges may be made without departing from the spirit and scope of theinvention as expressed in the appended claims.

I claim as my invention:

1. In a rubbing machine, in combination,

a reciprocatory slide, a pad holder secured to said slide, and a secondpad holder adjacent the first and pivotally Vsecured to the slide abouta fixed axis constrained to extend at all times in the direction ofreciprocation.

2. A rubbing machine having, in combination, a bearing slide, adownwardly displaced attachin portion on said slide, parallel downward yextending roje'ctions on said portion, and two pad hofders pivotallysecured to said projections, said pad holders on separate members beingpivoted on fixed being mounted in parallel closely spaced and alinedaxes extending in the direction relation on fixed pivotal axes extendingin of recprocation, and the other two being the direction ofreciprocation. arranged to lie in the same plane parallel 3. A rubbingmachine having, in co1nbito the alned axes.

nation, two members arranged to reciprocate In testimony whereof, l havehereunto in the same general direction, two pad affixed my signature.

holders on each member, two of the holders GUSTAF H. EKSTROM.

